Backup strategy when travelling

[meteorquake]

Generally I have two physical drives D & E for my data, so I don't have all my eggs in one basket (D also has a C partition for the OS). If one fails it's only half the data gone.
So I have two backup drives for them accordingly, D2 & E2.
Then when I am away from home which may be for months, I just take the main drives D & E with me, I wouldn't want to take them all with me as I could have a mishap where I lost them all.
My backup strategy then is copying changed files in D over to free space in E with complete D-drive filelist, and changed files in E over to free space in D with complete E-drive filelist. The easiest thing is to use 7z with full pathnames and drag in files since the last backup date. However I move files a lot - may be hundreds in a day - so it creates a bit of a mess but at least if one of the drives dies I've not lost anything, it just needs painfully reconstructing.
I think this is a general problem people would face when travelling. If someone has a single drive, maybe they use a memory stick to perform the partial backups.
I wonder if FreeFileSync could do the job properly? it has access to the file list of its last proper sync with the backup before you left to travel, so future backups it would need to use that list plus tracking the partial backup it is working with so that it doesn't back up files that are unchanged in content but registers their move if they've moved, and backs up files that are changed in content from the original and also from the last partial backup. In the end when you get home you perform a proper backup in which the partial can be discarded or, if your main drive died, merge the partial backup properly back into the original, moving/deleting files that had just moved/been deleted, updating changed ones using the partial and adding any new ones from the partial.
David

[xCSxXenon]

Why not have all of your eggs in all of your baskets instead? Just have the data consolidated onto one location and have it fully mirrored to the other(s)?