Using a USB stick for backups



I am using an 8 GB USB stick for my backups. The approach that I
follow consists of using rsync every other day in order to keep the
contents of the stuff in the backup in sync with the original stuff. My
question is, How long can I expect the USB stick to last?

I understand that a USB stick can be written to only so many
times, but I don't know how a write operation is to be accounted for in
this context. With my approach, the stick is written to intensively the
first time, when it is empty; however, every subsequent backup operation
will only copy the files/directories that have been changed in, or added
to, (and remove files/directories that have been removed from) the
original since the last backup operation.

Is this a sensible approach, or will it render my USB useless in
no time?

.



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