The bank is asking him to open two accounts, one for saving, on the grounds that it will protect his money

No File Exists
Check below answers in case you are looking for other related questions:
He gave his car to someone to sell it and buy a newer model for him. Is this riba?
Ruling on depositing money in riba-based banks

No File Exists
Related Answers:
Disposing of riba income received before one came to know that it is haraam
Estimating the amount of interest if it is mixed with the original money
Should he take a riba-based loan in order to buy a house?
He gave his car to someone to sell it and buy a newer model for him. Is this riba?
Ruling on depositing money in riba-based banks

Recommended answers for you:
Ruling on husband and wife playing while fasting
The time of Duha prayer
Is zinaa intercourse only?
Does masturbation without ejaculation break the fast?
Ruling on in-vitro fertilization (IVF)