Paragon's HDM & Macrium Reflect 8 [free & paid] let you perform image backups of USB sticks as well as (micro) SD cards in a USB reader. I use image backups for the micro SD cards I use with my Windows tablets, and for the bootable USB sticks created with apps like AOMEI's Partition Assistant, which I rarely if ever am going to use -- I have enough USB sticks to keep track of. It's usually faster to perform a USB stick backup or restore compared to file copy or backup, and the archives *may* be smaller, but there are Gotchas. Bear in mind that different brand/model USB sticks can behave differently, so YMMV.
A USB stick *pretends* it's a conventional hard disk, so while it may look like & behave roughly the same, the partition(s) that keep track of every file are different. You may not be able to restore a USB stick image to a hard disk, you can't restore a hard disk image to a USB stick, and you can't work with the partition on a USB stick, e.g. enlarge it. Tools like AOMEI Partition Assistant may let you do something like enlarge that partition, but like restoring a hard disk image to a USB stick, & the reverse, the result is likely to show up as a bad disk with multiple errors, e.g. cross-linked files.
Paragon HDM seems to make a sector by sector image of a USB stick, with the backup archive size that's the same as the USB stick's capacity. The size of a Macrium Reflect back up OTOH will reflect the amount of data on the USB stick. Restoring a backup using either app gives you a partition equal in size to the original -- if you restore a backup from a 16GB USB stick to a 32GB USB stick, roughly half of the larger capacity USB stick will be unusable. And as above, using a partitioning app to enlarge that partition is likely to show non-repairable disk errors.
A slower, less efficient alternative is to use Windows Robocopy, which while more complicated that drag & drop in Explorer, since you're using the Command Prompt, can be Much faster -- consider using it whenever you want/need to copy a large number of files.
docs.microsoft[.]com/en-us/windows-server/administration/windows-commands/robocopy