periodic

backup (copy of file or record)

important, significant

importance, consequence, significance

file (collection of papers) / (computing) file

fixed period / Short for 定期乗車券.

take

(computing) a filename

(computing) text file

"Clear file folder", a simple plastic sleeve (perhaps only somewhat opaque when a design is printed on it, as is common in promotional events) for holding documents, open on two consecutive sides and closed on two consecutive sides.