Since these erros seem to occur at nearly the same time, how about setting your computer to a different time zone for a few weeks or even longer. If the errors still occur at the same 'computer' time, if problem is computer related. However, if the errors occur at a time difference associated with the time zone difference, the cause is most likely external interference (local radio activity)
or with the ISS 'day' event. Or, something else.
Can't understand why anyone would need an hourly backup.
I think it does depend on the individual user. However, if all I wanted were daily backups, I'd use SuperDuper or CarbonCopyCloner. In fact, I use
both of them!
The reason I wouldn't use TM for that task is because both those apps make bootable copies.
TM does not make a bootable copy, nor is it designed to. It was
not designed to replace apps like SD or CCC. It is designed to make backups without much thought on the part of users (who too often simply give no thought to any kind of backup, I'm married to one of those people... and there are at least two more people living in this household with a similar lack of concern
).
The whole point of TM is to have an
incremental backup of any work you do during the last hour, plus all the versions of a file since it was created. SD and/or CCC will just have what was on the computer yesterday, not the originals of anything that changed. When your computer crashes after a days worth of work, that work will not be on any 'daily' backup that you have, even if it is a modified TM backup.
One of the reasons TM is so un-intrusice is because it does not have to make a complete backup of every single file on the drive. All it adds to the backup are the files that have changed in the last hour. If you change the hourly backup to something/anything longer, you will simply make those backups take longer, also.
TM hourly backups have saved by bacon too many times to remember. As I age I find it even easier to delete the wrong version of a file! So far, I have never ever needed/used either a SD or CCC backup. I still use them, even pay for them, but TM is much more important to my daily computer usage (stupidity recoveries or simply "let's just start over from the beginning").
SD/CCC: bootable recovery with whatever was on the machine when it was made
TM: recovery of any version of anything made since the last backup (normally not more than 1 hours ago)
Different apps/methods for different purposes/uses.
Of course, YMMV.
We now return to the regularly scheduled topic subject...