Your timer will have to run forever with my archive.... I see no problem with this but as with all electronic media you need to have a structure that works...
- clear archiving structure
- minimum 1 backup
- backup in another location
and of course on a regular basis "restoring" in order to avoid any aging problems and/or mechanical issues.
As long as you do that there should be no problems - in fact it will be much safer than the old negatives that could only be stored in one place with the risk that it means for fire etc.
Also - scanning my old kodachrime positives from the early sixties I found that the colours had started tio fade and it was high time to turn them digital so that my kids will be able to look at them when they have grown up.
I fell very good about my digital archive but as with everything else you need to think through how to make it work!
J