Are you updating these regularly or do you just accept out-of-date copies as backups? I kept local backup VFR charts on paper until they increased the update frequency, now it’s just way too much paper to justify.
I update them when they actually change. The version and last-updated date are printed on the bottom left corner. (Not the date on the side; that's the volume date, not the chart date.) For example one procedure I use frequently has "Orig-D 20DEC21" printed in the bottom left corner. If your electronic version stamp matches the one on the paper copy, nothing about the procedure has changed, even if a new volume has been published.