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Number : 827 Date : 2001-10-24 Author : Dan Anderson Subject : Re: Restoring from Full And Incremental Copy Size(KB) : 8
Towards your objective, I believe that xxcopy can be run so that it only looks for files that have been created after a time that you specify (e.g. the last time that you made a run of xxcopy) and then you could direct xxcopy to "clone" the results to an empty directory of your choosing. This would generate the various separate incremental backups that were referred to earlier. It seems to me that you could run incremental restores by cloning in the reverse direction but specifying that xxcopy should not delete any files on what is now the destination drive/directory except as the result of replacing older files with duplicate names. As you noted, this does not of course resolve the problem of deleting all the files that should be deleted but that may be a secondary consideration. Regards, ...Dan =============================== ----- Original Message ----- From: Luis J. Olivares Requejo To: Sent: Tuesday, October 23, 2001 5:41 PM Subject: Re: [xxcopy] Restoring from Full And Incremental Copy > Dan, the approach proposed is usefull for Rolling-back in a > daily basis. > > I'll like many times a day checkpoints of CRITICAL file > changes. I NEED roll-back if something wrong is detected at > the end of the day. Then i'll be able of restoring back to > the point desired. For example if a "wrong action" is > performed and data become corrupted, the next copy will be > corrupted too... If i have checkpoints i can roll-back. Of > course, having six or seven full copies woul'd be the > siplest solution, but i need to expend a lot of time > copying and a lot os hard drive space. > > This way i can say something like "Go back until 3 o'clock > copy" or "data have become corrupted and the situation > detected at 8:00 Pm; roll-back, previous copy until a > correct on", etc. > > With full back ups i need at last 6 full copies. On the > other hand, every incremental copy is about 10% of the full > data. > > I cannot solve the "to delete" list by now. > Sure there is a solution to this need. The "only" two > required rules are: > > - 1st: I cannot make 6 full 4Gb copies during the day. I > have not space enought and it expends a lot of time. > > - 2nd: I NEED to be able of rolling-back to any of the > previous "during-the-day" copies. > > > I'll apreciate any solution. > > --- Dan Anderson escribió: > > Luis, you may need someone smarter than me to sort this > > out. > > > > My limited understanding is working with xxcopy where it > > makes a full copy2 > > (clone) of the specified drive or subdirectories and then > > incremental runs > > will keep that full copy updated for any subsequent > > changes that occur up to > > the time that the xxcopy is run again. With that > > approach, the only way to > > have alternate checkpoints to choose from for restores > > would be to make full > > backup copies of each updated version of the clone. > > > > Your comments suggest an alternate approach (I don't know > > if Kan and the > > group have addressed this in the past because at first > > thought it doesn't > > seem too practical). That approach would be to have the > > option EACH time > > that xxcopy is run to: a) save any new files to a NEW > > and SEPARATE > > directory area which would duplicate the directory > > structure of the original > > source drive, b) identify files "to be" deleted in > > ANOTHER separate > > directory area (i.e.. don't actually delete the files on > > the original full > > clone nor prior incremental backups), and c) each time > > that xxcopy is run > > it must compare the current source directory contents > > with the COMBINED > > result of the original clone all subsequent incremental > > clones to determine > > what is a new-new file and new "to be" deleted files. > > When restores are > > done there would have to be some way to access all the > > various separate > > directory structures AND actually perform deletions for > > the "to be" deleted > > files AND somehow cope with changes to the directory > > structure. > > > > I don't know if I'm missing anything basic, but I don't > > see a practical > > implementation for what you are looking for, with or > > without xxcopy. > > > > Others' thoughts are welcome if only to confirm that such > > a wish-list is not > > practical with current basic technology or to show me > > that my thinking on > > this is too shallow !! > > > > Regards, > > > > ...Dan > > > > ========================= > > > > > > ----- Original Message ----- > > From: Luis J. Olivares Requejo > > To: > > Sent: Saturday, October 20, 2001 8:22 PM > > Subject: Re: [xxcopy] Restoring from Full And Incremental > > Copy > > > > > > > Hi again and thank you: > > > > > > So approach is making full backups every time? > > > I'm thinking in something like: > > > - Full Backup Every day (to cd-rw) > > > - At 8.0 a.m i make a full copy to another HD. > > > - At 12.0 a.m i make an incremental xxcopy using > > switches > > > for copying only new files and deleting if doesn't > > exist in > > > source. > > > - At 14.0 a.m i make an incremental xxcopy using > > switches > > > for copying only new files and deleting if doesn't > > exist in > > > source. > > > - At 16.0 a.m i make an incremental xxcopy using > > switches > > > for copying only new files and deleting if doesn't > > exist in > > > source. > > > - At 18.0 a.m i make an incremental xxcopy using > > switches > > > for copying only new files and deleting if doesn't > > exist in > > > source. > > > > > > This way i have an updated copy of the source. > > > Im interested in using copies at 12,14,16,18 as > > > "checkpoints" so i can "rool back" to any previous > > > situation, but i'm not interested in 4 full copies of > > > "everything". (think in 4 Gb Data with only 20 Mb > > changing > > > envery 2 hours, for example"). > > > > > > any suggestion about? > > > > > > --- Dan Anderson > > escribió: > > > > Luis, I'm not sure I fully understand but I'll try to > > > > respond. > > > > > > > > Using xxcopy is different than the old approach of > > > > creating a full > > > > backup and then separate incremental backups. To > > restore > > > > under the old > > > > approach you would restore the full backup and then > > the > > > > incremental, and > > > > would indeed be back at 100 files. > > > > > > > > Using xxcopy, a full backup is first made. When the > > > > second run is made, > > > > xxcopy will directly update the first backup that was > > > > made so that you > > > > now have 97 files. To restore, simply restore these > > 97 > > > > files. Don't > > > > make two restore runs. > > > > > > > > It seems to me that when you ran your second backup, > > you > > > > first made a > > > > copy of the full backup so that you had one copy that > > > > would not be > > > > affected when you made the incremental backup. If > > that's > > > > the case then > > > > simply ignore that copy of the full backup that you > > made > > > > on your first > > > > run. You do not need it to restore your 97 files. > > > > > > > > Hope that helps. > > > > > > > > Good luck. > > > > > > > > ...Dan > > > > > > > > > > > > ================================== > > > > > > > > > > > > > > > > ----- Original Message ----- > > > > From: Luis J. Olivares Requejo > > > > > > To: > > > > Sent: Friday, October 19, 2001 2:37 PM > > > > Subject: Re: [xxcopy] Restoring from Full And > > Incremental > > > > Copy > > > > > > > > > > > > > Please, can someone help me with this question? > > > > > > > > > > Tahnk you. > > > > > --- luis_j_olivares@y... escribió: > Supouse i > > > > make a > > > > > FULL copy to a CD (for exambple 100 > > > > > > files) > > > > > > > > > > > > some days later i make an incremental backup. Whe > > > > done > > > > > > the contnts of > > > > > > the backuped zone 3 files have been deleted, so > > the > > > > new > > > > > > "state" of > > > > > > the backuped ares is now 100-3=97 files. Ten more > > > > files > > > > > > have changed. > > > > > > > > > > > > Now i DELETE the backuped zone. > > > > > > > > > > > > I want to restore now. > > > > > > > > > > > > If i restore full backup first and incremental > > backup > > > > > > later, all the > > > > > > files are restored fine but the 3 ones deleted > > after > > > > the > > > > > > first full > > > > > > backup are there. > > > > > > > > > > > > > > > > > > How can i solve that? > > > > > > > > > > > > > > > === message truncated === > > _______________________________________________________________ > Do You Yahoo!? > Yahoo! Messenger > Comunicación instantánea gratis con tu gente. > http://messenger.yahoo.es > > > > > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ > >
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