I ask these same question on the terabyte forum, no answer yet for 2 weeks, so I thought I would ask here too.
Hello, I am new to IFW (as in purchased last month (April)).
I would like to know best methods when using /hash and /usemd for faster differential backups (use only /hash, only /usemd, or use both)?
What about the backup option for /del (delete the hash files used to create the backup). Does it delete the hash files used because the deleted hash files will never be needed again (e.g. for future differential backups in the chain)?
I did a test full backup with the options /hash and /usemd. Later I did a differential backup with the options /hash /del /usemd. After the Diff backup completed, I noticed it deleted all the hash files created by the full backup. Does this mean the next Diff backup will no longer have hash files to do a faster diff backup?
Last question, when using the backup strategy of Full + Differentials, would the /hash /usemd only be needed on the full backup. I ask because the differential backups are always using the full’s TBI file as the base, so do you you need hash files from a previous diff backup?