Should I defragment my external backup HDD drive
I recently noticed that my new (3 months old) external HDD that I use for my daily incremental backups (6 increments in each chain with retention of 4 chains) is repeatedly becoming significantly fragmented (22% this time), even though I had scheduled weekly optimisation for it. I also noticed that something unknown to me had turned off the scheduled optimisation. Last time I noticed this (possibly 2 to 3 weeks ago), I manually defragmented the disk, and turned the scheduled optimisation back on. This is somewhat of a mystery, as before I replaced the HDD with a newer model from the same manufacturer (WD), I did not experience this. I should also mention that my backup disk is only about 40% used.
My questions are:
1. Should I be concerned about this?
2. Should I manually defragment the HDD if the scheduled optimisation continues to be turned off by some unknown agent?


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