1. Assess Your Needs:
   Understand the types of materials you need to archive (documents, audio-visual items, etc.) and any specific requirements based on your industry.

2. Experience and Expertise:
   Look for archival services with a strong background in your area of concern. Review their experience with similar materials.

3. Certification and Standards:
   Ensure the service complies with industry standards for preservation, such as ISO or other relevant certifications.

4. Technology and Tools:
   Investigate the technology they use for digitization, storage, and retrieval. Modern tech can enhance accessibility and preservation.

5. Storage Conditions:
   Inquire about the environmental controls in their storage facilities (temperature, humidity, light exposure) to ensure optimal preservation.

6. Security Measures:
   Ask about security protocols for both physical and digital archives, including disaster recovery plans.

7. Access and Retrieval:
   Check how easy it is to access and retrieve your materials. Flexible options for access can be crucial.

8. Cost Transparency:
   Review the pricing structure and be aware of any hidden fees associated with services such as digitization or retrieval.

9. Testimonials and References:
   Look for client testimonials and ask for references to gauge their reliability and service quality.

10. Long-term Viability:
    Consider the company's sustainability and long-term plans to ensure they will be around to manage your archives in the future.

11. Privacy and Confidentiality:
    Make sure they have strict policies regarding the privacy and confidentiality of sensitive materials.

12. Consultation Services:
    Some archival services offer consultations; take advantage of this to clarify any questions and understand their processes better.

13. Training and Support:
    Check if they provide training or support for your staff to effectively manage and interact with archived materials.

By keeping these tips in mind, you can make a more informed decision when choosing archival services.